ios - CoreData写对象慢

Question

我正在从网络服务下载地址列表(15.000 个地址)。获取所有地址可能需要 800 毫秒，另外还需要 15 秒才能将它们写入 CoreData。不对的地方请指教:

AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
            NSManagedObjectContext *managedObjectContext = delegate.managedObjectContext;
            for (NSDictionary *dict in addresses) {
                [self saveAddressesToCoreDataWithDictionary:dict andManagedObject:managedObjectContext];
            }
            [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"alreadyDownloaded"];

和方法:

-(void)saveAddressesToCoreDataWithDictionary:(NSDictionary *)dict andManagedObject:(NSManagedObjectContext *)managedObject
{

    NSManagedObject *address;
    address = [NSEntityDescription insertNewObjectForEntityForName:@"Address" inManagedObjectContext:managedObject];

    [address setValue:[[dict objectForKey:@"lat"] stringValue] forKey:@"lat"];
    [address setValue:[[dict objectForKey:@"lon"] stringValue] forKey:@"lon"];
    [address setValue:[dict objectForKey:@"addressLong"] forKey:@"addressLong"];
    [address setValue:[dict objectForKey:@"addressShort"] forKey:@"addressShort"];
    NSError *error;
    [managedObject save:&error];

}

Answer 1

想通了!

问题是我每次都在保存 managedObjectContext，它应该只在迭代完成时保存。

刚刚移动了这一行:

if ([managedObjectContext save:&error] == NO) {
                NSAssert(NO, @"Error saving context: %@\n%@", [error localizedDescription], [error userInfo]);
            }

下面的for循环。